Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var to_iterate = new Array(100);
    for (var i = 0; i < 100; i++) {
      to_iterate[i] = i;
    }
  };
</script>

Test runner

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var to_iter_length = to_iterate.length,
    squared = [];
for (var d = 0; d < to_iter_length; d++) {
  squared.push(Math.pow(to_iterate[d], 2));
}

function square_num(num) {
  return Math.pow(num, 2);
}
var squared = to_iterate.map(square_num);

var squared = to_iterate.map(function square_num(num) {
  return Math.pow(num, 2);
});

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